Vehicle-brake.



w. c. CARR. VEHICLEBRAKE. APPUCATION FILED JULY 23.1917.

1,297,093. Patnted Mar. 11,1913;

WILLIAM C. CARR, OF BUFFALO, NEW YORK.

VEHICLE-BRAKE.

Specification of Letters Patent.

Patented Mar. 11, 1919.

Application filed July 23, 1917. Serial N 0. 182,234.

To all whom it may concern:

Be it known that I, WILLIAM C. CARR, a citizen of the United States,residing at Bufialo, in the county of Erie and State of New York, haveinvented certain new and useful Vehicle-Brakes, of which the followingis a specification.

This invention relates to vehicle brakes, and more particularly to atype of brake especially adapted to motor-driven trucks.

In the operation of trucks which are driven in either direction, it isessential that the brake be equally effective whichever the direction ofoperation and that the brake action be equal in degree in bothdirections. It is also necessary in the operation of such trucks thatthe release be immediate whichever the direction of operation.

The object of my invention is, therefore, to provide a brake which ispositive in its operation and equally effective in both directions ofoperation.

The drawing herewith is a side elevation of a brake-drum provided withmy improved brake, the nuts of the several pivotbolts being omitted forclearness of illustration.

The brake-drum l is of the usual type. The fixed support for thebrake-band and mechanism is shown at 2 and may be of any desired form ofconstruction. The

- brake-band 3 is provided with the usual lining 4C, and the brake isshown in the released position.

Diametrically opposite the free ends of the brake-band 3 a lug 5 isrigidly secured to the outer face of the brake-band. This lug has a slot6 which engages with a pin 7 in a standard on the fixed support 2. Thislug holds the brake-band against movement in rotation but permits thenecessary radial movement.

Pivoted to a standard of the fixed support 2 is a bell-crank leverhaving arms 8 and 9, and a lever 10 integral therewith or attachedthereto for operating the same. Similarly pivoted to said standard is abellcrank lever having arms 11 and 12. The arms 8 and 11 are pivotedrespectively to the free ends of the brake-band 3. The arms 9 and 12 arepivoted to a link 13. The

' of said brake-band,

lever 10 connects with a brake-rod. The arms 8 and 11 are of equallength, and the arms 9 and 12 are of equal length.

It will now be seen that, if the lever 10 is moved downwardly, the freeends of the brake-band 3 will be drawn toward each other equally by thearms 8 and 11, and at the same time the slot 6 will permit the lug 5 tomove inwardly on the pin 7 but without rotational movement. Thus bothportions of the brake act equally and the action is the same whicheverdirection the drum is rotated. Moreover, in addition to the equaldistribution of the brake action, the release action is equal andpositive with respect to both portions and dragging action is entirelyeliminated.

Having thus described my invention, I claim:

1. In a brake of the type described, the combination with a brake-drum,a brakeband and a support, of two bell-crank levers pivoted to saidsupport, an arm for actuating one of said bell-crank levers, twocorresponding arms of said bell-crank levers of equal length beingpivoted to the free ends a link pivoted to the other arms, which are ofequal length, and means oppositely situated to the free ends of saidbrake-band engaging said brake-band to hold the same against movement inrotation and permitting axial movement.

2. In a brake of the type described, the combination with a brake-drum,a brakeband and a support, of two bell-crank levers. the correspondingmembers of which are of equal length, pivoted to said support andpivoted respectively to said brake-band, a link connecting the otherarms of said bell-crank levers, an arm for actuating one of saidbell-crank levers, a lug on said brakeband diametrically opposite itsfree ends having a slot adapted to engage a pin on said support, a pinon said support engaging in said support, whereby said brakeband is heldagainst movement in rotation but permitted to move radially and wherebythe free ends of said brake-band are acted upon equally.

WILLIAM C. CARR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

